The best thing at this point of time is to get evaluated by a neurosurgeon in person. I would recommend getting a CT Scan
of your brain done in addition because this is one investigation which can confirm or exclude if you have something really serious within your head which is the cause for your severe headache
or not. Many a times, the pupils might be doing fine initially but problems creep on after a few days therefore it is advisable not to waste time and visit the hospital.